InlineDataSource (druid-processing 27.0.0 API)

java.lang.Object
- org.apache.druid.query.InlineDataSource

All Implemented Interfaces:

DataSource
```
public class InlineDataSource
extends Object
implements DataSource
```
Represents an inline datasource, where the rows are embedded within the DataSource object itself.
The rows are backed by an Iterable, which can be lazy or not. Lazy datasources will only be iterated if someone calls getRows() and iterates the result, or until someone calls getRowsAsList().

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`Function<SegmentReference,SegmentReference>`	`createSegmentMapFunction(Query query, AtomicLong cpuTimeAcc)` Returns a segment function on to how to segment should be modified.
`boolean`	`equals(Object o)`
`static InlineDataSource`	`fromIterable(Iterable<Object[]> rows, RowSignature signature)` Creates an inline datasource from an Iterable.
`DataSourceAnalysis`	`getAnalysis()` Get the analysis for a data source
`byte[]`	`getCacheKey()` Compute a cache key prefix for a data source.
`List<DataSource>`	`getChildren()` Returns datasources that this datasource depends on.
`List<String>`	`getColumnNames()`
`List<ColumnType>`	`getColumnTypes()`
`Iterable<Object[]>`	`getRows()` Returns rows as an Iterable.
`List<Object[]>`	`getRowsAsList()` Returns rows as a list.
`RowSignature`	`getRowSignature()` Returns the row signature (map of column name to type) for this inline datasource.
`Set<String>`	`getTableNames()` Returns the names of all table datasources involved in this query.
`int`	`hashCode()`
`boolean`	`isCacheable(boolean isBroker)` Returns true if queries on this dataSource are cacheable at both the result level and per-segment level.
`boolean`	`isConcrete()` Returns true if this datasource can be the base datasource of query processing.
`boolean`	`isGlobal()` Returns true if all servers have a full copy of this datasource.
`RowAdapter<Object[]>`	`rowAdapter()`
`boolean`	`rowsAreArrayList()`
`String`	`toString()`
`DataSource`	`withChildren(List<DataSource> children)` Return a new DataSource, identical to this one, with different children.
`DataSource`	`withUpdatedDataSource(DataSource newSource)` Returns an updated datasource based on the specified new source.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Method Detail
  - fromIterable
```
public static InlineDataSource fromIterable(Iterable<Object[]> rows,
                                            RowSignature signature)
```
    Creates an inline datasource from an Iterable. The Iterable will not be iterated until someone calls getRows() and iterates the result, or until someone calls getRowsAsList().
    
    Parameters:
    
    rows - rows, each of the same length as signature.size()
    
    signature - row signature
  - getTableNames
```
public Set<String> getTableNames()
```
    Description copied from interface: DataSource
    
    Returns the names of all table datasources involved in this query. Does not include names for non-tables, like lookups or inline datasources.
    
    Specified by:
    
    getTableNames in interface DataSource
  - getColumnNames
```
public List<String> getColumnNames()
```
  - getColumnTypes
```
@Nullable
public List<ColumnType> getColumnTypes()
```
  - getRowsAsList
```
public List<Object[]> getRowsAsList()
```
    Returns rows as a list. If the original Iterable behind this datasource was a List, this method will return it as-is, without copying it. Otherwise, this method will walk the iterable and copy it into a List before returning.
  - getRows
```
public Iterable<Object[]> getRows()
```
    Returns rows as an Iterable.
  - rowsAreArrayList
```
public boolean rowsAreArrayList()
```
  - getChildren
```
public List<DataSource> getChildren()
```
    Description copied from interface: DataSource
    
    Returns datasources that this datasource depends on. Will be empty for leaf datasources like 'table'.
    
    Specified by:
    
    getChildren in interface DataSource
  - withChildren
```
public DataSource withChildren(List<DataSource> children)
```
    Description copied from interface: DataSource
    
    Return a new DataSource, identical to this one, with different children. The number of children must be equal to the number of children that this datasource already has.
    
    Specified by:
    
    withChildren in interface DataSource
  - isCacheable
```
public boolean isCacheable(boolean isBroker)
```
    Description copied from interface: DataSource
    
    Returns true if queries on this dataSource are cacheable at both the result level and per-segment level. Currently, dataSources that do not actually reference segments (like 'inline'), are not cacheable since cache keys are always based on segment identifiers.
    
    Specified by:
    
    isCacheable in interface DataSource
  - isGlobal
```
public boolean isGlobal()
```
    Description copied from interface: DataSource
    
    Returns true if all servers have a full copy of this datasource. True for things like inline, lookup, etc, or for queries of those.
    Currently this is coupled with joinability - if this returns true then the query engine expects there exists a JoinableFactory which might build a Joinable for this datasource directly. If a subquery 'inline' join is required to join this datasource on the right hand side, then this value must be false for now.
    In the future, instead of directly using this method, the query planner and engine should consider JoinableFactory.isDirectlyJoinable(DataSource) when determining if the right hand side is directly joinable, which would allow decoupling this property from joins.
    
    Specified by:
    
    isGlobal in interface DataSource
  - isConcrete
```
public boolean isConcrete()
```
    Description copied from interface: DataSource
    
    Returns true if this datasource can be the base datasource of query processing. Base datasources drive query processing. If the base datasource is TableDataSource, for example, queries are processed in parallel on data servers. If the base datasource is InlineDataSource, queries are processed on the Broker. See DataSourceAnalysis.getBaseDataSource() for further discussion. Datasources that are *not* concrete must be pre-processed in some way before they can be processed by the main query stack. For example, QueryDataSource must be executed first and substituted with its results.
    
    Specified by:
    
    isConcrete in interface DataSource
    
    See Also:
    
    which uses this, which uses this
  - createSegmentMapFunction
```
public Function<SegmentReference,SegmentReference> createSegmentMapFunction(Query query,
                                                                            AtomicLong cpuTimeAcc)
```
    Description copied from interface: DataSource
    
    Returns a segment function on to how to segment should be modified.
    
    Specified by:
    
    createSegmentMapFunction in interface DataSource
    
    Parameters:
    
    query - the input query
    
    cpuTimeAcc - the cpu time accumulator
    
    Returns:
    
    the segment function
  - withUpdatedDataSource
```
public DataSource withUpdatedDataSource(DataSource newSource)
```
    Description copied from interface: DataSource
    
    Returns an updated datasource based on the specified new source.
    
    Specified by:
    
    withUpdatedDataSource in interface DataSource
    
    Parameters:
    
    newSource - the new datasource to be used to update an existing query
    
    Returns:
    
    the updated datasource to be used
  - getCacheKey
```
public byte[] getCacheKey()
```
    Description copied from interface: DataSource
    
    Compute a cache key prefix for a data source. This includes the data sources that participate in the RHS of a join as well as any query specific constructs associated with join data source such as base table filter. This key prefix can be used in segment level cache or result level cache. The function can return following - Non-empty byte array - If there is join datasource involved and caching is possible. The result includes join condition expression, join type and cache key returned by joinable factory for each PreJoinableClause - NULL - There is a join but caching is not possible. It may happen if one of the participating datasource in the JOIN is not cacheable.
    
    Specified by:
    
    getCacheKey in interface DataSource
    
    Returns:
    
    the cache key to be used as part of query cache key
  - getAnalysis
```
public DataSourceAnalysis getAnalysis()
```
    Description copied from interface: DataSource
    
    Get the analysis for a data source
    
    Specified by:
    
    getAnalysis in interface DataSource
    
    Returns:
    
    The DataSourceAnalysis object for the callee data source
  - getRowSignature
```
public RowSignature getRowSignature()
```
    Returns the row signature (map of column name to type) for this inline datasource. Note that types may be null, meaning we know we have a column with a certain name, but we don't know what its type is.
  - rowAdapter
```
public RowAdapter<Object[]> rowAdapter()
```
  - equals
```
public boolean equals(Object o)
```
    Overrides:
    
    equals in class Object
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - toString
```
public String toString()
```
    Overrides:
    
    toString in class Object

Class InlineDataSource

Method Summary

Methods inherited from class java.lang.Object

Method Detail

fromIterable

getTableNames

getColumnNames

getColumnTypes

getRowsAsList

getRows

rowsAreArrayList

getChildren

withChildren

isCacheable

isGlobal

isConcrete

createSegmentMapFunction

withUpdatedDataSource

getCacheKey

getAnalysis

getRowSignature

rowAdapter

equals

hashCode

toString